Prepare
the batter as per sponge cake, but a little thinner by mixing a
little water.

Make this cake in the
biscuit tray. Grease the tray and put the butter paper and spread the batter,
evenly thin in the tray. Bake the cake at 375f. For 10-15 minutes. On the
other butter paper, dust sugar. Put the cake tray over the dusted sugar paper.
Remove the upper butter paper. Apply fruit jam in the center of the cake and
roll the cake with the butter paper. Roll it a little and remove the butter
paper. Make the roll a little tight. Keep the roll for 10-15 minutes and then
make icing.

This type of roll cake is
useful in making engines of then train. If cut cross, then can be used as stem
for decoration.